Don’t worry, your Moscow Mule copper mug isn’t going to kill you

A minor panic broke out when Iowa banned restaurants and bars from using copper mugs due to safety concerns.

The FDA guidelines say that copper shouldn’t come to contact with foods that have a pH below 6.0. The pH of Moscow Mules is well below 6.0, but the copper mugs that are usually served with the drink are lined with tin or stainless steel.